It may indirectly similar in that it is Sun magic, as someone suggested in the cbox; I think it makes sense as fire is highly painful and Sun magic is opposite of the dark power of the Moon. I am willing to subject Rikyn to fireballs and such to see. <3
Could try inhaling some sort of substance that is harmful to the lungs, as well, so to be "pouring salt" on the afflicted region. Bonfire smoke should suffice, I'd think. :/ Unfortunately I don't have easy access to fire so that would be easier for someone else to try.